Well, when you need to be directed by a director who speaks only English & mostly everyone else who doesn't speak your primary tongue, it's not that easy... As for learning, probably bits of English. Also, he became child actor overnight, after being found & cast... Maybe learning the ropes, etc... I was born abroad, having moved here around 12 years of age... My son is in acting... He was 6 at the time... That's hard not to understand much, being pointed here & there and doing your job... Heck, sometimes behaving is not easy at that age... My child is currently 6.5. He was born here... While based on what I read, Sunny & my child (Adam) would get along via signals by hands, giggles and tablet, there is a huge difference in knowing 4-5 words & being born here & understanding/speaking the language.